So bungie just did the step where I have to draw out and defeat Ecthar at the same time as the final boss. This is for the arc exotic sword. I was in a fire team with two other friends of which one was at the same step as I was. We completed it and went back to the tower to claim our rewards. My friend got his exotic sword though I did not receive mine. And so we thought I had to be the one to actually kill Ecthar. But when I went to restart the mission again on the dreadnaught the mission was not there. I tried logging off and back on but still nothing. I would really like my exotic arc sword but it's impossible at the moment, please help.